Multiflow control valve



March 14, 1950 H. P. KUPlEC 2,500,758

MULTIFLOW CONTROL VALVE 4 Sheets-Sheet 1 Filed Jan. 22, 1949 INVENTOR.H/mm 15/1 /56 ArrOR'A/E/J H. P. KUPlEC MULTIFLOW CONTROL VALVE March 14,1950 4 Shets-Sheet 3 Filed Jan. 22, 1949 A IroKA/E/J March 14, 1950 H.P. KUPIEC 2,500,758

MULTIFLOW CONTROL VALVE 7 Filed Jan. 22, 1949 I 4 Sheets-Sheet 4 vINVENTOR. H/LQFV I? KUP IE6 BY Maw i atentec l Mar. 1 4, 1950 2,500,758MULTIFLOW CONTROL VALVE Harry P. Kupiec, Paramus, N. J assignor to AirAssociates, Incorporated, Teterboro, N. J a corporation of New JerseyApplication January 22, 1949, Serial No. 72,117

13 Claims.

co-pending application, Serial No. 775,231, now

abandoned.

The invention has in view a multi-flow control valve adapted to bearranged in a hydraulic system for manually controlling an operationalpart of aircraft and the like such as landing gear, arresting gear, wingflaps, speed brakes, wheel brakes, escape chute door cylinders and thelike and for producing a non-pressurized system when the operationalparts are in set position or not in use.

Another object of the invention is to provide a control valve whichautomatically reduces the pressure in the hydraulic system to zero whenan operational part has completed the movement to set position or hascompleted the movement to operative position to thereby provide anormally non-pressurized system which minimizes rupture in the systemand reduces the fire hazard since the hydraulic fluid employed readilyatomizes and bursts into flame upon rupture-in the system.

Still another object of the invention is to provide a control valvewhich is constructed to prevent premature reduction of the hydraulicpressure in the system to zero before the operational part has completedits movement to set position.

Still another object of the invention is to provide a multi-flow controlvalve which may be employed with a multiple number thereof in series inthe system, with each valve adapted for independent operation forcontrolling an operational part without interfering with the use of theother control valves in the system or for preventing the independent useof any of the operational parts controlled thereby.

The invention further provides in a modified form thereof, a multi-flowcontrol valve having a reciprocatory shuttle located within and forminga valve element within a manually actuated valve element and whichshuttle is moved by the differential of pressure on the opposite endsthereof for automatically returning thesystem from a pressurized to anon-pressurized system. 7

With the foregoing and other objects in view, reference is now made tothe following specification and accompanying drawings in which thepreferred embodiments of the invention are illustrated.

In the drawings:

Fig. l is a view in side elevation of a multifiow control valveconstructed in accordance with the invention.

Fig. 2 is an end view thereof with the upper portion of the hand controllever broken away.

Fig. 3 is an enlarged longitudinal sectional view taken approximately online 3-3 of Fig. 2.

Fig. 4 is an enlarged transverse sectional view taken approximately online 44 of Fig. 1.

Fig. 5 is an enlarged transverse sectional view taken approximately online 5-5 of Fig. 1.

Fig. 6 is a similar View taken approximately on line 6-6 of Fig. 1.

Fig. 7 is a schematic view of a pressure system showing two of themulti-flow' control valves in the system with certain of the parts ofthe system shown in section.

Fig. 8 is a top plan view of a multi-fiow control valve embodying amodified form of the invention.

Fig. 9 is a longitudinal vertical sectional view taken approximately online 9-9 of Fig. 8.

Fig. 10 is a longitudinal horizontal sectional view taken approximatelyon line Hll 00f Fig. 9.

Fig. 11 is'a transverse vertical sectional view taken approximately online ll-H of Fig. 9.

Referring to the drawings by characters of reference and moreparticularly to the form of the invention illustrated in Figs. 1 to 7thereof, the multi-flow valve is adapted to be employed in a pressuresystem for controlling the movement of operational parts of aircraft andthe like, and as illustrated in Fig. 7 of the drawings two such valvesare connected in series in the system for operating landing gear,arresting gear and the like, it being understood that any number of suchvalves may be employed for independently operating and positioning of anoperational part having a pressure responsive device in the system withthe valves respectively.

The valve indicated generally by the reference character l0 consists ofa valve body ll of rectangular formation in plan having alignedlongitudinally extending bores 12 and I3 opening through the oppositeends thereof which are closed at one end of the body by plates l4 and I5and at the opposite end thereof by an apertured plate (6 in whichslidably protrudes the outer ends of a plunger 11 and a shaft l8respectively arranged in said bores for longitudinal reciprocatorymovement therein.

The plunger I1 is pivotally connected at its outer end to one end of alink [9 having its opposite end pivotally connected to a control lever20 provided with an enlarged rounded upper end 3. 2!. The shaft I8 issecured at its outer end in a bifurcated element 22 pivotally connectedwith the control lever between the furcations thereof. The plunger 1! iscut away or reduced in diameter at longitudinally spaced portionsforming peripheral recesses 25, 26 and 21 between the wall of the borel2 and the faces of the cut away portions and which provide outermostperipheral lands 28= and 2 9' and intermediate peripheral lands 3!] and3| on opposite ends of the peripheral recess 26. The said lands slidablyfit the bore 12- a while the outermost lands 28 and 29 are recessed v toreceive annular packing 32 to prevent'outward flow of the fluid betweenthe said lands and the wall of the recess. The plunger His formed with alongitudinally extending bore 34 having radially arranged outlets 35 and36 at theropposite' ends thereof respectively. The outlets 35 open intothe peripheral recess adjacent the-pe ripheral land while; the outlets36 open into L the peripheral recess 21- adjacent the peripheral land3|. The bore 34 extends partway through the plunger l1 and is closed atits inner end by a screw plug 3-1.

The shaft- I8 is cut away or reduced in diameter at longitudinallyspaced portions adjacent its innerend so as to form peripheral recesses39, 40 and M between the wall of the bore l3 and thefaces of therecessed portions and to provide larged bore portion and provides a headagainst which the pressure of the fluid is exerted so as to retaintheshaft l8astationary or in fixed position. during themovement of theoperational part to operative positions;

Arranged. on-the shaft I8 is a tubular member 41 having anapertured'inner end 68 through 5 whichthe shaft protrudes with theenlarged open end 49 of the. tubular member secured in. the

' bore l3 between a-bearing sleeve'50. and an annular shoulder 5| formedin thebore; The bearing sleeve 50. protrudes through the. plate 16 andslidably receives the shaft l8 which is normally tensioned. againstmovementby a coiled expansion spring 52' arranged in surroundingrelation with the shaft. and engaged at its ends against a split tubularspring retainer 53 and a split flanged disk 54. The split tubularspring-retainer 53 and. the split flanged disk 54 form completeannulusesl when: the split portions. thereof. are in mating relationabout the. shaft. The flanged disk is tensioned by the spring 52againstvt-he annular shoulder 55 formed by the enlarged end 69 of thetubular member 41 with the flange thereof slidably fitted inan annular.recess 56 formed in said shaft. The tubular spring retainer 53 is formedwith an outwardly extending peripheral flange 51 at its outer endwhich'is tensioned by said spring against the recessed. face 58"of said1 bearing sleeve 50; while the opposite end of said spring retainer isformed with an inwardly directed annular flange 59" which extends intoand slidably fits the recess 56 in the shaft I81 By'thi'sconstructionthefianged' disk is tensioned against the annular shoulder60 formed by the-annular recess'56 in the shaft l8, while the inwardlydirected annular flange 59 of the spring retainer 53 is tensionedagainst the oppositely disposed annular shoulder 6| formed in the shaftit by said annular recess. The axial length of the annular spacesurrounding the shaft l8 between the confronting ends of the springretainer 53 and the flanged disk 54 is the length of movement of theshaft 18 in either direction in the" bore l 3which movement isapproximately one-eighthof an inch.- This movement is imparted to theshaft It by the control lever 20 which may be moved in either directionwith reference to the tubular member 47 and in. order to preventpremature reduction of the pressure of thefluid during the movement ofthe operational part to operative positions, the shaft is formed with anannular-piston head 62 secured thereto and snugly and slidably fittingthe annular inner wall of the tubular member 41. The said piston head isnormally located substantially midway between spaced apertures 63 and 64in the wall of' the tubular member 4 which open at their inner ends intothe tubular member on opposite sides of the pistonzheadzfiland at theirouter ends the said apertures open into the annular space between thetubular member 41 and the wall of the enlarged portion 45 of the borel3. This provides a dashpot construction which forces the fluid pressureout throughthe opening 63 and in: through the opening 64 when the shaftI8 is moved in one direction and Vice versa whenthe shaft is moved-intheopposite direction, and which functions to preventpremature movement ofthe shaft l8 to non-pressurize the system whenthe fluid pressure:against the flange or head 45 is momentarily reduced due to sudden gustsof-wind; against the operational part.

The valve body H is: formed with fluid pressuresupplyand: return; ports55 and 66 which open intothe peripheralmecesses 25 and 26 respectively.The. valve body is also provided. with two: service ports 67 and S8: Theport Bl opens into a: passageway ea communicating with the bore t2 and.is controlled for the passage of fluid therethrough'by the land 31'which is normally arranged in partially covering releati'on therewith.The service port 68 communicates at its inner end with the BI'JLiaIgBd-DDItiQH' QE J of the bore l3 betweeri the enlarged! end 49' of. thetubular member and theflange 45* ofthe shaft l8. At the i'unctureof theenlarged=-bore portiondt of the bore l3 withthe: reduced: portionthereof, the

same is provided with a passageway it which opens-into=the borer lie.and-is controlled for the flow of fluid therethroughby the land 35 whichis normally disposed" in? partially covering relation therewith.- Thevalve body also includes two fluid; pressure ports H 'and'iz both ofwhich open into: the reduced portion of th'e bore l3.

Constructed in this manner the valve is of the multi-flow type inwhich-the fluid pressure is adapted to be: admitted to the valve throughthe pressure port: fifi'and by manipulation of the control-leveezilZ-to-flow outthrough either onevof the service ports E l and: 68 tothe pressure-responsive device (not shown) which controls the:operational part-and which" is exhausted through theother' of saidvser'viceports 5-1 and 68 and thencedischargedfrom the valve through the.return. port 651 The fluid" pressure is also admitted to thevalvethrough the pressure port H in order: to-effect the-non-pressurizing ofthe system, the: fluid: being discharged through the other [pressureport 72.

One or more of the valves Illimay be connected afluid 'pressureisystem:for independently controlling operational parts of an aircraft or thelike. As illustrated in Fig. '7 of the drawings two such valvesindicated generally by the reference characters IIIA and IUB are inseries in the system for controlling the flow of fluid pressure to thepressure responsive devices for operating the landing gear and arrestinggear respectively of an aircraft. in addition thereto, the fluidpressure system includes a variable pump P, a pilot relief valve Q and areservoir R. The pilot valve Q includes inlet and outlet fluid pressureports S and S and inlet andoutlet return ports T and T and a pilot fluid:port U. The high pressure side of the variable volume pump P isconnected with the inlet fluid pressure port S by piping I6, theopposite fluid pressure port S being connected by piping IT with thefluid pressure port 65 of each of the valves III. The fluid return port66 of each of the valves I0 is connected by piping I8 with the returnport T of the pilot valve, the opposite return port T' being connectedby piping I9 with the inlet side of the reservoir R while the outletside of the reservoir is connected by piping 80 with the low pressureside of the variable volume pump P.

The valves are connected in series through the fluid pressure ports IIand I2 by piping 8I which connects the fluid pressure port I2 of thevalve IOA with the fluid pressure port II of the valve NIB, the fluidpressure port 'II of the valve IIlA being connected with the pilot fluidport U by piping 82 and the fluid pressure port I2 of the valve IOBbeing connected by piping 83 with the piping I9 leading to thereservoir. The service ports 61 and 68 of each of the valves arerespectively connected by Ipiping 84 and 85 to the opposite ends of thepressure responsive devices (not shown) which control the operation ofthe landing gear and arresting gear respectively as indicated in thedrawings, it being understood that the piping 84 constitutes the fluidsupply piping to each of the pressure responsive devices when theoperational part is moved in one direction while the piping 85constitutes the return line therefor and when the operational part ismoved in the oppostie direction the piping 85 constitutes the fluidpressure line while the piping 84 constitutes the return line.

The pilot valve Q may be of any desired type but as illustrated the sameincludes a centrally arranged sleeve 86 formed with a reduced end 81 soas to provide an annular recess 90 between the same and the body of thevalve in communication with the return ports T and T. The pilot valve Qalso includes a reciprocatory piston 9| fitted at one end in the body ofthe valve adjacent the pilot fluid port U and having a reduced inner end92 slidably fitted in the sleeve 86. The said piston is formed with achamfer 93 which is adapted to engage an annular seat 94 formed on theenlarged end of the sleeve 86 for closing off the flow of the fluidpressure from the fluid pressure port S to an annular recess 95 locatedbetween the sleeve 86 and the piston 9|. The recess 95 is incommunication with the annular recess 90 and the return ports T and T bymeans of a duct 96 in the enlarged end of the sleeve 86.

The piston 9| is also provided with a duct 91 communicating with thefluid pressure port S and with the hollow interior of the enlarged endof said piston for permitting of the flow of the fluid from the fluidpressure port S through the pilot fluid port U and the, piping 82 to thevalves. The piston 9| is engaged by acoiled expansion spring 98interposed between the enlarged end thereof and the adjacent end of thecasing of the pilot valve Q which functions to move the piston 9| toposition the chamfer 93 on its seat 94 when the flow of the fluidpressure through the ports II and I2 has been shut ofi so as to increasethe pressure in the piping 82.-

The piston 9| is moved in the opposite direction by the fluid pressurefrom the fluid pressure port S so as to move the piston to open thepassageway with the duct 96 when the fluid pressure in the piping 82 andin the enlarged end of the piston has been lowered by the opening up ofthe flow of the fluid pressure through the ports II and 12.

In use and operation the control lever 20 of the valve is alwaysdisposed in position either to the right or to the left of the verticalposition shown in Fig. 1 of the drawings. In connection with theoperation of a landin gear, the same would be disposed in a loweredposition when the control lever is swung in one direction and when thecontrol lever is swung in the opposite direction the landing gear wouldbe in raised position.

When the control lever 28 of any one of the valves is swun to the rightof the view shown in Fig. l of the drawings, the plunger I! is movedoutwardly or to the right while the shaft I8 is moved inwardly or to theleft. The movement of the plunger H to the right permits flow of thefluid pressure through the fluid port 65 into the recess 25 and thencethrough the outlets 35, bore 34, outlets 36, passageway 69 and throu hthe service port 61 to the pressure responsive device (not shown) whichcontrols the operational part. The fluid pressure is exhausted from saidpressure responsive device through the service port 68 into the enlargedportion 45 of the bore I3 and thence through the passageway 18 and intothe annular recess 26 from which it is discharged through the returnport 66. The inward movement of the shaft I8 positions the land 42 incoverin relation with the narrow opening I3 at the inner end of thefluid pressure port II to thereby shut off the flow of the fluidpressure from the fluid port U of the relief valve Q. The shutting olfof the flow of the fluid pressure through the pressure ports II and I2changes'th'e system from a non-pressurized system to a pressurizedsystem which remains pressurized during the period that the operationalpart is being moved to set position. The inward movement of the shaft I8effects inward movement of the spring retainer 53 therewith until theflanged inner end 59 thereof is compressed by the spring 52 against theouter end of the flanged disk 54 which forms a stop to limit the inwardmovement of the shaft. This inward movement of the shaft forces thefluid pressure from within the tubular member 41 through the aperture 63and into the enlarged portion 45 of the bore I3 while fluid pressurefrom the service port 68 flows through the enlarged portion 45 of thebore I3 thence through the aperture 64 and into the tubular member 41 onthe opposite side of the flange 62 and is then discharged through thedischarge port 66.

The flow of fluid pressure from the pressure responsive device (notshown) through the service port 68 produces a pressure head against theouter face of the annular flange 46 of the shaft I8. This pressure headretains the shaft I8 in stationary ,or fixed position during themovement of the operational part to set or operative an angular 93, r.positionsw and prevents. premature.- reductionof. the hydraulicpressureiin; the. system-to non-press surized condition; Thus".resistance to the movement of anoperational part such BJSLWing. flaps;

. by sudden gusts of. wind is not. transmitted;- to

- the handlever 20.-

The: pressure" head against;

the flange .46: retains the: shaft I8 in inward poi- I the bore I3. Whenthis takes place, the openational part has. been moved. to set positionwhereuponthe spring; 52 functions to move the shaft tutor its outermostposition asshownin Fig; B of. the drawings. whereby the. land: 42 is."

moved from covering. relation" with: the; reduced inner end Hi of? the:pressure port- H to thereby open up: the; fluid lineto the fluid:pressure supply through the fluid pressure portU to there:-

byreduce the. pressure against the enlarged'end of the piston9I-:.whereuponz the piston isvmoved to open the duct BIS-and bypassthefiuidwtoa the reservoir which effects anon-pressurizing. of=the system.

Whenthe control lever 20ml any one-of. the:

valvesvis swung tdtheleft' ofth'eview shown. in.Fig.. 1 of the drawings.the. plunger i1. is moved inwardly or to the ,Ieit whilenthe shaft I8=isv moved.v outwardly: or. to the: right. ment of the plunger I? tothe'left; permits flow of thefluidpressure. through the port 65:111110the; recess. 25' and thence through the service port 1-0- to-thepressure responsive device (not shown) which controls the operationalpart.

"lfherfiuidv pressure; is exhausted from the-*oper ationalrpart throughthe service port 61- and is discharged through the return port 66'. Thefluid. pressurer from theservice port H3: passes throughthe:enlargedportionv 4-5 of the bore IB-and pro ducesa pressurehead'against the inner face: of the flangez 46 soas=to maintain theshaft I'8--= inoutwardi positionauntilthe operational part. has, beenmoved. to; set or operative position whereuponthe shaft I8 will be-movedinwardly byth'espring. 52 to opgen thepassageway between the:fluidpressure. ports; i I" and I2:- soa-s' to; non-- pressurize-thesystem ThepumpP is of. the variable" volume type I which functions to:increasethe flow of the: fluid and. the pressure thereof when any one;of the valves I0 inthezsystemis operated to effect move ment; of anoperational part; In hydraulic fluid.

systems for operation of alanding, gear; the fluid pressure isapproximately- 3,000 poundsper square.

inch. I This-pressure is maintained: in the system so: long as thelanding gear is being moved; When however, the piston 91 is movedtopermit-flow of the. fluid. through; the annular recess 95- for returnto the reservoir; the system becomes nonpressurized. The pressure.however, is sufficient to efiect acontinual-fiow of the fluid through.the

fluid. pressure ports. H andof. the-valves in the system and. throughthereturn line 83- to the. reservoir. Thus the valves: I B and thesystem are non-pressurized when the operational. part is. in set oroperative position or is not being moved. to thereby reduce. the. wear.and tear on. thevalves and the/likelihood. of ruptureof. the systemwiththe consequent. ignition of the: fluid.

It will be. understood. that. sudden gusts or;

wind. may strike. the operational. part during.

movement thereoftooperative position and such The movewind: pressureagainst the operational. part may reduce the: pressure. andthe flown-offluidi against thesflange-or head' lfi Oftheshaft; When this takesplacezthespring 5:2"functions to retain the shaft. in position: soi as 1to prevent. premature movement thereof toenon-pressurize the system.

In thewform of the invention illustrated. in Figs. 8'to"11 inclusive ofthedrawings, the'multi-flow valve indicatedzgenerally by the referencecharacter' Iflmconsistsofa valve bodyldl of rectangular formatiorrginplan having. a longitudinally extending; bore I02 openinguthrough theopposite endsthereofn The-bore I 02 is closed. by a. plug Ma atoneendthereof. and by an apertured plug. m4 at the opposite end: inwhich is slidably. arrangedva rod lll'5 pivotally, connectedat its outerend-to -thei-loweri endi'of a. control lever [06. The 1100141115115"formed with an enlarged inner end I01 secured oneend of a tubular valveelement I08- for imparting reciprocatory'movement to said valvev elementlongitudinally of: the bore 12 by manipulation of: the control leverI06.

The valve'element m8 is cut away or reduced in diameter; at:longitudinally spaced. portions forming peripheral recesses I09'a'nd H0.and providingperipheral lands. HI and. H2 at the opposite endsof said.valve element and an intermediate peripheral landv H3. between said.recesses, which landsslidablyfitthe bore I02. The valve element 1.83.13.closed at one endby said enlarged inner end. [810i the rod I05; and. bya plug. H4 at. the. opposite end. Locatedwithin the valve element I 8.8is a. reciprocatory shuttle I I 5- having. arylindrical central. portionH6 and longitudinally projecting reduced end portions I I IL Thecentral. portion H6 slidablyfits the. inner periphery. of the valveelement I.Il8-- while the reduced: end portions. I I1. are normallyspaced from the. enlargedinner end I Ill of the rod- I05 and the plugI-I.6 to. permit .of longitudinal reciprocatory movement of .saidshuttle within the valve element. The reduced. ends I II also providechamhers. I. i.8-. between the. same and the inner periphery. of. thevalve. element M8 and surrounding. thereduced ends .I I l arematchedcoiled contractilesprings I- I9 which. are.tensioned at theirinner. endsiagainst the. central-portion H6. of the. shuttle and attheir outer ends against the. enlargedinner endlll'l of therod I05. andthe. plug I.'II4,'. the said. springs. functioning, to normally maintainthe. shuttle medially between the opposite ends of said valve element.The enlarged inner. end Ill'l'oftherod' I" and'the plug II4 sure. port.I23; which opens through a side wallthereof." and communicates-at. itsinner end. with a. passageway I21! extending longitudinally of the-borem2. and opening. through branch openings I'25 and. I26. into theperipheral. recesses. wil and. lid respectively... A. fluid return portmil-opens through. the opposite sidewall of the valve. body, andcommunicates. at its inner end. with apassageway L28 extending.longitudinally of the bore I92 and. located on. the opposite sidethereof from the passageway I24. The return port I2? istl'ocatedmedially of branch openings I29; and. I30 which extend laterally fromsaid passageway Iziiiand. openin-to the bore. I02 ad.- jacent the plugsHi3 and I04 respectively.

The valve body "II also includes two fluid pressure ports I 3| and I32which open through the top thereof and extend inwardly radially of thevalve element I08. The said fluid pressure ports are each provided withtwo reduced branch openings I33 and I34 which normally align at theirinner ends with radially arranged apertures I35 and I36 in the wall ofthe valve element I08 in equally spaced relation on opposite sides ofthe longitudinal center of the land II3 thereof. The apertures I35 andI36 normally register at their inner ends with peripheral grooves I31and I38 formed in the periphery of the central portion II6 of theshuttle H in equally spaced relation on opposite sides of thelongitudinal center thereof.

A pair of longitudinally spaced service ports I39 and I40 open throughthe upper horizontal face I4I of the valve body with their reduced innerends I42 and I43 opening into the bore I02 so that the flow therethroughis controlled by the lands III and H2 of the valve element I08.

The control lever I06 projects above the valve body IOI and is providedwith an enlarged knob I44 for facilitating manipulation thereof. LinksI45 are pivotally connected by pivot pins I46 and I4! to the controllever I06 and to a bracket I48 aflixed to the end of the valve body sothat the pivot pin I46 provides a fulcrum about which the lever isrocked.

The plugs I03 and I04 are provided with recesses I49 and I50 at theirinner ends respectively which permit of the flow of fluid pressureagainst the ends of the valve element I08 when the valve element isdisposed against said plugs. The ends of the valve element I08 arebeveled.

as at I5I so as to provide a vent through the] service ports I39 and I40to eliminate any pos-;' sibility of a hydraulic lock occurring in pipingconnected therewith. Constructed in this man'-' her, the valve is of themulti-flow type in which the fluid is adapted to be admitted to thevalve through the pressure port I23 and by manipu-' lation of thecontrol lever I06 to flow out through either one of the service portsI39 and I40 to the pressure responsive device (not shown) which controlsthe operational part and which is exhausted through the other of saidservice ports I39 and I40 and thence discharged from the valve throughthe return port I2'I. The fluid is also admitted to the valve throughthe pressure port I3I in order to effect the non-pressurizing of thesystem irrespective of the position of the valve element I08, the fluidbeing discharged through the pressure port I32.

In use and operation one or more of the valves I00 may be connected inthe fluid system indicated in Fig. 7 of the drawings in a manner- Inconnectionsimilar to the valves WA and IOB. with the operation of alanding gear, the same would be disposed in lowered position when thecontrol lever I06 thereof is swung to an angular position on one sideand when swung to an an-' gular position in the opposite direction thelanding gear would be moved to an elevated position. When the controllever I06 is swung to the right the movement thereof will shift thevalve element I08 to the left against the plug I03 thus opening theservice port I39 to the peripheral The aforesaid movement of fluidpressure from the pressure responsive device.

The aforesaid movement of the valve element I08 also efiects movement ofthe shuttle or valve element II5 therewith, that is towards the left ofthe view shown in Fig. 9 whereby the fluid pressure ports I3I and I32are closed. When the valve is installed in the fluid pressure systemshown in Fig. '7, the aforesaid movement of the shuttle or valve elementII5 would build up the pressure in the pipe line 82 leading from thehigh pressure port I39 and connected with the relief valve Q at thelarge end of the piston 92 which is then moved to engage the annularseat 94 to close off the flow of the fluid pressure from the fluidpressure port S through the annular recess 95 and duct 96 to thereservoir R. The fluid pressure from the pump P is then directed throughthe fluid pressure ports S and S of the relief valve Q and through thepiping to the pressure port I23 and thence through the valve I06 to thepressure responsive device for actuation of the operational part.

The fluid return from the pressure responsive device, through theservice port I40 establishes a differential of pressure on the oppositeends of the shuttle or valve element II5 admitted through the ducts I20and I2I to thereby move the shuttle to the left and to compress thelefthand spring I I9 so as to maintain the fluid pres-' sure ports I3Iand I32 in closed relation so long as the fluid pressure is beingexhausted from the pressure responsive device through the service portI40. When the fluid pressure is completely exhausted from the pressureresponsive device; the pressure will be equalized at the oppo.-- siteends of the valve element I08 and on the opposite ends of the shuttleII5 with;

in the valve element whereby the shuttle will be moved to the right sothat the peripheral recess I38 will register with the aperture I36 inthe valve element and with the branch opening I33 of each of thepressure ports I3I and I32 to thereby open up said ports to permit theflow of fluid pressure through the valve. This results in the movementof the piston 92 so as to permit of flow of the fluid pressure throughthe annular recess I9 and by-pass the same to the reservoir.

When however, the annular passageway 91 of the relief valve Q is openfor the passage of the fluidpressure to the reservoir, the systembecomes non-pressurized.

What is claimed is:

1. In a multi-flow control valve, a valve body having fluid inlet andoutlet ports, two service ports and two auxiliary ports, two valveelements mounted for reciprocatory movement in said valve body tocontrol the flow of fluid through said auxiliary ports and to controlthe flow of fluid from the inlet port through one of said service portsand the return flow through the other service port and the dischargethereof through the outlet port, and one of said valve elements having ahead against which the pressure of the fluid flowing through the valveis exerted for retaining said valve element in position to prevent theflow of fluid through said auxiliary ports during the time that thefluid is flowing through the service ports.

2. In a multi-flow control valve, a valve body having fluid inlet andoutlet ports, two service ports and two auxiliary ports, two valveelements extending into said valve body, a lever pivoted The pressure ismaintained in the' system so long as the landing gear is being raised.

to the :outer .ends 'of said valve elements 'izior simultaneously movingsaid valve elements *by the swinging movement of saidIBVBITtOJCOl'ltl'Ol the flow of fluid through said auxiliary-ports. andtoacontrol the flow of fluidfrom the inlet .port through one .of saidservice ports and the return flow through'the other service port/andz-thexdischarge thereof through the outlet lportgand one of said valveelements having a head against which the pressure of ithepfluid flowing:through the valve is exerted for retaining .saidwalve-:element inposition to 'preventthe flow :of fluid through said auxiliaryports.duringfthetimezthat the fluid is. flowing through the-service ports.

:3. In .a multi-flow controlvalve, :a valve body having "fluid inlet:and outlet ports, two service ports and two auxiliary :portsytwo valveelements extending-into :said valve body andzmountedsior rec'iprocatorymovement to control the :flowzof fluidl through said auxiliary portsand. from-tithe inlet-port through one of said service portsaandthe.2return flow through the-other serviceeport and the dischargethereof through'the outlet port, means 'tensioning one of said valve.elementsf'ror normally moving the same into position to apermit theflow of fluid through said auxiliarvports, and said last mentioned valveelement having a head against which the pressure of the 1fluidtflowp ingthroughthe'valve is exertedfor retainingssaid valve element in;positionto prevent the flow :of fluid through said-auxiliary'ports duringthevtime that the fluid is flowing through theservice ports.

4. :In a multi-flow control valve,-:a valvezrbody havingparallellongitudinally extending main and auxiliary cavities, fluid.inlet ":and soutlet ports the flow of fluid through said auxiliaryportaia-nd said last mentioned valve element having ahead agalinst whichthe pressure of the fluid flowing through one of said servioeports is*exerted, -for retaining said last mentioned valve elementwin positionto prevent the flow offluid throughusa-i'd auxiliary ports during thetime'thatvthe-fluidds flowing through the service ports.

5. In a multi-flow control valve,.a-valve body having parallellongitudinally extending main and auxiliary cavities, fluid inlet andoutlet ports opening into said main cavity, two serviceports openinginto said cavities respectively, a passageway between saidcavities andtwo auxiliaryports open-ing into said auxiliary cavity, a valve 1618"ment mounted for reciprocatory movement in said maincavity forcontrolling the fiowoffluid from said inlet port through said serviceports and the discharge thereof through said outlet port, a valveelement mounted for reciprocatory movement in said auxiliary :cavity forcontrolling the flow .of fluid through said auxiliary ports, meanstension-ing said last mentioned-valvie aelement for normally moving thesame into position to permit the flow of fluid through said auxiliaryports, and said last mentioned valve element having a head against which:thecpressure oif the fluid flowing throughsaid valvetisexerted m)-position to the tensionof said means :forretainlu said last:mentionedvalve element imposition totl reventithe flow-oi fluid:th-ro'ugh said-auxiliaiy port'seduring the time that the firstmentioned valve r element ,is in *position to permit .the flow of fluidthrough said service .ports.

56. In :a-multi-flow control :valve, a valve :body having :fluid inletand outlet ports, two service portsxand two auxiliary ports, two valveelements extending into. said'valvewbody and' mounted for reciprocatorymovement to control the :flow of fluid through said auxiliary :ports andfrom "the inlet port-through one of said service ports andthe-returnflow through the otherserviceport and the discharge "thereofthrough the outlet .port, ,means'tens'ioning one of saidvalvexielements-for normally moving the same into position to per mittheflow of fluid through said auxiliary iports, said "lastmentioned valveelement ,having: .a head against which the pressure oi the fluid flowingthrough the valve is exerted 'for retaining said valveelement inposition toprevent the flow of fluid through said auxiliary ports duringthe time that the fluid isvflowing through the service ports, said'tensioning means functioning :to movesaid last mentioned valve element'into position *to permit "the how of fluidxthrough saidauxiliary-'portswhen' the flow of fluid through the service ports :hasceased.

"'7. 'lin-amu'lti flow "control valve, a valve body having fluid inletand outlet porte -two service ports and-two auxiliary ports, two -valveelements mounted for reciprocator movement in said valve body, a leverpivoted to said valve elements for-simultaneously moving one ofsaidvalve elements in one directionand-the otherof saidvalve element'inthe opposite direction to-control'lthe flow oiffld through saidauxiliary ports and to last mentioned-valve element into position to permit of the flow of fluid through said auxiliary portswhen the flow :offluid through the service ports has ceased.

In-a :multi-flow control valve, a valve body having fluid inlet andoutlet ports, two service ports :ancl'two auxiliary ports, two valveelements mounted for reciprocatory movement in said body for controllingthe flow of'fluid'throughsaid auxiliary ports and-from the inlet portthrough one ofssaid service ports and the return flow through the otherservice port and-the discharge there-of through the. outlet .port, one:of said valveelements having a headagainst Which the pressure of thefluid flowing through; the valve is exerted for retaining .said valveelement in position to prevent the flow of fluid through said auxiliaryports during the timerthat the fluid is flowing through'the serviceports, and means ltensioning said last mentioned valve element f ormoving the same into pos-i-tionito'zpermit :of "the flow of fluidthrough the auxiliary ports when the pressure of the fluid is relievedfrom'tthei'head of said last mentioned valve element.

229, In a'multii-flowcontrol valve, a valveibody having a longitudinallyextending cavity, a fluid inlet port opening into said cavityintermediate the ends thereof, a fluid return port having branchesopening into said cavity adjacent the ends thereof and a pair of serviceports opening into said cavity in longitudinally spaced relation, ahollow valve element located in said cavity for longitudinalreciprocatory movement, a control lever connected with said valveelement for moving the same to a position to permit of the flow of thefluid from said fluid inlet port through one of said service ports andthe return flow of fluid through the other service port and thedischarge thereof through the fluid return port and for moving saidvalve element to an opposite position to permit of the flow of the fluidfrom said fluid inlet port through the last mentioned service port andthe return flow of fluid through said first mentioned service port andthe discharge thereof through the return fluid port, a shuttle locatedin the hollow interior of said valve element for longitudinalreciprocatory movement therein, said valve body having inlet and outletauxiliary fluid ports each having branches opening into said cavity inlongitudinally spaced relation, said valve element having longitudinallyspaced apertures opening through the wall thereof adapted to registerwith said branch open ngs and said shuttle having grooves in theperiphery thereof spaced apart a distance corresponding to the spacingof the openings in said valve element for permitting of the flow offluid through said auxiliar inlet port and the discharge thereof throughsaid auxiliary outlet port when the pressure on the opposite ends of theshuttle is equalized, said valve element having openings for admittingthe pressure of the fluid to the opposite ends of said shuttle formoving the shuttle by the differential of pressure on the opposite endsthereof to dispose said grooves out of registry with the apertures insaid valve element to thereby shut off the flow of fluid through saidauxiliary ports.

10. In a multi-flow control valve, a valve body having an interiorcavity and fluid inlet and outlet ports opening into said cavity and apair of service ports Opening into said cavity in spaced apart relation,a hollow valve element located in said cavity for reciprocatorymovement, a control lever connected with said valve element for movingthe same to a position to permit of the flow of the fluid from saidinlet port through one of said service ports and the return flow offluid through the other service port and the discharge thereof throughthe fluid outlet port and for moving said valve element to an oppositeposition to permit of the flow of the fluid from said fluid inlet portthrough the last mentioned service port and the return flow of fluidthrough said first mentioned service port and the discharge thereofthrough the outlet fluid port, a shuttle located in the hollow interiorof said valve element for reciprocatory movement therein, said valvebody having inlet and outlet auxiliary fluid ports each having branchesopening into said cavity in spaced apart relation, said valve elementhaving apertures opening through the wall thereof in spaced apartrelation corresponding to the spacing of said branch openings and saidshuttle having grooves in the periphery thereof spaced apart a distancecorresponding to the spacing of the openings in said valve element forpermitting of the flow of fluid through said auxiliary inlet port andthe discharge thereof through said auxiliary outlet port when thepressure on the opposite ends of the shuttle is equalized, said valveelement having openings foradmitting the pressure of the fluid to theopposite ends of said shuttle for moving the shuttle by the differentialof pressure on the opposite ends thereof to dispose said grooves out ofregistry with the apertures in said valve element to thereby shut offthe flow of fluid through said auxiliary ports.

11. In a multi-flow control valve, a valve body having an interiorcavity and fluid inlet and outlet ports opening into said cavity and apair of service ports opening into said cavity in spaced apart relation,a hollow valve element located in said cavity for reciprocatory movementand having recesses for the passage of fluid, acontrol lever connectedwith said valve elementfor moving the same to positions permitting ofthe flow of fluid from said inlet port through said recesses and throughsaid service ports and the discharge of fluid through the outlet port, ashuttle located in the hollow interior of said valve element forreciprocatory movement therein, means tensioning said shuttle in saidvalve element to move the shuttle therewith, said valve body havinginlet and outlet auxiliary ports each having branches opening into saidcavity in spaced relation, said valve element and shuttle havingpassageways spaced apart a distance corresponding to the spacing of saidbranch openings and adapted to register therewith, said valve elementbeing open for admitting the pressure of the fluid to the opposite endsof said shuttle for mov ing the shuttle against said tension means bythe differential of pressure against the opposite ends r of said shuttleto dispose the passageways of said shuttle and valve element out ofregistry to thereby shut off the flow of fluid through said auxiliaryports, and the means tensioning said shuttle functioning to return theshuttle to dispose the passageway thereof in registry with thepassageway of the valve element to permit of the flow of fluid throughsaid auxiliary ports when the pressure on the opposite ends of theshuttle is equalized.

12. In a multi-flow control valve, a valve body having an interiorcavity and fluid inlet and outlet ports opening into said cavity, ahollow valve element located in said cavity for reciprocatory movement,a control lever for moving said valve element to opposite positions, ashuttle located in the hollow interior of said valve element forreciprocatory movement therein, said valve body having inlet and outletauxiliary ports, said valve element and shuttle having passagewaysadapted to register with the auxiliary ports for permitting of the flowof fluid therethrough, and said valve element being open for admittingthe pressure of the fluid to the opposite ends of said shuttle formoving the shuttle by the differential of pressure against the oppositeends thereof to dispose the passageways of the shuttle and valve elementout of registry to thereby shut ofi the flow of fluid through saidauxiliary ports.

13. In a multi-flow control valve, a valve body having an interiorcavity and fluid inlet and outlet ports opening into said cavity, ahollow valve element located in said cavity for reciprocatory movement,a control lever for moving said valve element to opposite positions topermit of the flow of fluid through the valve, a shuttle" located in thehollow interior of said valve element for reciprocatory movementtherein, means tensioning said shuttle to move the same with said valveelement, said valve body having inlet and outlet auxiliary ports, saidvalve element 1251 with ithe gmuc iliapy ports for permitting not;-2;ma;='z.fi13 I as andashutfleiha'vmggpassagewayshaxiaptedato regis-IREEERENQES GIT-ED ithezifiowwfdiuid htherethroughpand said. valve ggifig g fi q record n the e lgmentabeingnopen far iadmittingthe pressure@f .:.theafluid-;to the pposite ends-ofsaid :shuttle 5 UNITED STATES-PATENTS :fm'znWingafl-m shutble aigainstsaid-tensiontmeans Number Datehyrdifiarenbialvo'f pressure against'the opposite ii2358;950 @Tra'Jutman"Sept 26 v19 4 ends of said shuttle to dispose the passageways 2 AdamsMar. 1949- flfaitheas'shuttlemnd valve-element out of registryztmtherehy shut dff theifiow of ,fluidthrough said v10 sauxiliagygports.

=H.-ARRY P. KU-PIEC.

